Share This Author
The importance of feldspar for ice nucleation by mineral dust in mixed-phase clouds
The results from a global aerosol model study suggest that feldspar ice nuclei are globally distributed and that fellspar particles may account for a large proportion of the iceuclei in Earth’s atmosphere that contribute to freezing at temperatures below about −15 °C.
Impact of nucleation on global CCN
- J. Merikanto, D. Spracklen, G. Mann, S. Pickering, K. Carslaw
- Environmental Science, Physics
- 12 November 2009
Abstract. Cloud condensation nuclei (CCN) are derived from particles emitted directly into the atmosphere (primary emissions) or from the growth of nanometer-sized particles nucleated in the…
The Met Office Unified Model Global Atmosphere 7.0/7.1 and JULES Global Land 7.0 configurations
- D. Walters, A. Baran, M. Zerroukat
- Environmental ScienceGeoscientific Model Development
- 26 October 2011
Abstract. We describe Global Atmosphere 7.0 and Global Land 7.0 (GA7.0/GL7.0), the latest science configurations of the Met Office Unified Model (UM) and the Joint UK Land Environment Simulator…
Large contribution of natural aerosols to uncertainty in indirect forcing
A sensitivity analysis on a global model is performed to quantify the uncertainty in cloud radiative forcing over the industrial period caused by uncertainties in aerosol emissions and processes and suggests that improved measurements and evaluation of simulated aerosols in polluted present-day conditions will not necessarily result in commensurate reductions in the uncertainty of forcing estimates.
Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation
First results from the CLOUD experiment at CERN are presented, finding that atmospherically relevant ammonia mixing ratios of 100 parts per trillion by volume, or less, increase the nucleation rate of sulphuric acid particles more than 100–1,000-fold and ion-induced binary nucleation of H2SO4–H2O can occur in the mid-troposphere but is negligible in the boundary layer.
Cosmic Rays, Clouds, and Climate
Physical mechanisms have been proposed to explain how cosmic rays could affect clouds, but they need to be investigated further if the observed correlation between cosmic ray intensity and Earth's average cloud cover is to become more than just another correlation among geophysical variables.
A Thermodynamic Model of the System HCl-HNO3-H2SO4-H2O, Including Solubilities of HBr, from <200 to 328 K
An analytic expression for the composition of aqueous HNO3‐H2SO4 stratospheric aerosols including gas phase removal of HNO3
An analytic expression is given for the composition and volume of stratospheric HNO3-H2SO4-H2O aerosols in terms of the temperature and total amounts of H2O, HNO3 and H2SO4, taking into account…
Stratospheric aerosol growth and HNO3 gas phase depletion from coupled HNO3 and water uptake by liquid particles
- K. Carslaw, B. Luo, S. Clegg, T. Peter, P. Brimblecombe, P. Crutzen
- Environmental Science, Physics
- 15 November 1994
Aqueous sulphuric acid droplets, which constitute the background stratospheric aerosol, strongly absorb HNO3 and HCl under cold conditions. A thermodynamic model is used to predict partitioning of…
Description and evaluation of GLOMAP-mode: a modal global aerosol microphysics model for the UKCA composition-climate model
Abstract. A new version of the Global Model of Aerosol Processes (GLOMAP) is described, which uses a two-moment pseudo-modal aerosol dynamics approach rather than the original two-moment bin scheme.…